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Magnetic properties of Fe76X2Si8B14

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Author(s): Ł. Madej | Z. Stokłosa | A. Chrobak | P. Kwapuliński | J. Rasek | G. Haneczok

Journal: Archives of Materials Science and Engineering
ISSN 1897-2764

Volume: 34;
Issue: 1;
Start page: 9;
Date: 2008;
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Keywords: Amorphous materials | Soft magnetic properties | Magnetostriction coefficient

ABSTRACT
Purpose: The idea of the paper is to study the influence of thermal annealing and alloying additions on magneticproperties, optimization and crystallization processes in Fe76X2Si8B14 (X=Al, Cr, Mo) amorphous alloys.Design/methodology/approach: For annealed samples (1 h, Ta ranging from 300 K to 800 K) at roomtemperature magnetic permeability was measured by applying Maxwell-Wien bridge (frequency about 1030 Hzand magnetic field H=0.5 A/m). Magnetostriction coefficients – parallel and perpendicular were determined byapplying infra-red magneto-dilatometer. Magnetization in saturation versus temperature was measured by makinguse of magnetic balance (field 0.5 T).Findings: It was shown that alloying additions in the examined alloys cause a decrease of the Curie temperature,an increase of magnetic permeability and magnetization in saturation. The observed ESMP (enhancement of softmagnetic properties) effect in the examined alloys can be attributed to the so-called relaxed amorphous phase freeiron nanograins. It was shown that parallel and perpendicular magnetostriction coefficients depend on annealingtemperatures which means that these quantities are sensitive on free volume content.Research limitations/implications: The obtained results are a part of a broad area of examinations devotedto establishing of the influence of different alloying additions and thermal annealing on soft magnetic propertiesof amorphous alloys obtained by melt spinning technique.Practical implications: The examined alloys belong to a modern group of soft magnetic materials, which canbe used as core transformers, magnetic sensors, shields of magnetic etc. The obtained results may be used forpreparing soft magnetic ribbons for specific applications.Originality/value: The originality of the paper lies in examination of the influence of free volume content onmagnetostriction coefficients.

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